FreeBSD: fix double-prepended plugin path for link
FreeBSD: fix double-prepended plugin path for link

The plugin path is already in the listed filename and can be used
directly.

Also remove a commented line that isn't needed anymore.

esproul/nad,keithf4/nad,hjhart/nad,maier/nad,circonus-labs/nad,esproul/nad,maier/nad,keithf4/nad,HeinrichHartmann/nad,HeinrichHartmann/nad,sean-/nad,esproul/nad,keithf4/nad,sean-/nad,circonus-labs/nad,sean-/nad,HeinrichHartmann/nad,circonus-labs/nad,maier/nad,maier/nad,maier/nad,circonus-labs/nad,HeinrichHartmann/nad,keithf4/nad,hjhart/nad,sean-/nad,HeinrichHartmann/nad,keithf4/nad,hjhart/nad,HeinrichHartmann/nad,esproul/nad,hjhart/nad,sean-/nad,maier/nad,circonus-labs/nad,esproul/nad,circonus-labs/nad,hjhart/nad